The effectiveness of repairing damaged Concrete-Filled Fiber Reinforced Polymer (FRP) Tube (CFFT) axial members is studied. The damage was introduced in the form of linear cuts through the full tube thickness. The effectiveness of adhesively-bonded FRP patches that may or may not include mechanical fasteners is investigated. The study varied the cut angle, the bond length of the patch, the fiber type being glass or carbon, the number and pattern of mechanical fasteners, the patch extension beyond cut tips, and compared wet layup glass-FRP (GFRP) patches to prefabricated GFRP shells cut from a similar tube. It was shown that the vertical cut reduced axial compressive strength significantly. As the bond length of the GFRP repair patch increased the axial strength recovery increased, but not fully. When the ends of the GFRP patch were overlapped, a full strength recovery was achieved. The prefabricated GFRP shell patch (cut from similar tube) provided the highest strength recovery, compared to FRP wet layup. Adding mechanical fasteners enhanced strength recovery further, to a certain point. A simple empirical design model is proposed and a design example is presented.

中文翻译：

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管材破损的FRP管混凝土柱修复

研究了修复受损的纤维增强聚合物混凝土（FRP）管（CFFT）轴向构件的有效性。损坏以穿过整个管厚度的线性切口的形式引入。研究了可能包含或不包含机械紧固件的粘合 FRP 补片的有效性。该研究改变了切割角度、补片的粘合长度、玻璃纤维或碳纤维类型、机械紧固件的数量和图案、补片超出切割尖端的延伸范围，并将湿法敷层玻璃纤维增​​强塑料 (GFRP) 补片与预制补片进行了比较GFRP 外壳由类似的管材切割而成。结果表明，垂直切割显着降低了轴向抗压强度。随着 GFRP 修复补片的粘合长度增加，轴向强度恢复有所增加，但不完全。当 GFRP 补片的末端重叠时，实现了完全强度恢复。与 FRP 湿法叠层相比，预制 GFRP 外壳补片（从类似的管材上切割而成）提供了最高的强度恢复。添加机械紧固件在一定程度上进一步增强了强度恢复。提出了一个简单的经验设计模型并给出了一个设计实例。